Python-使用特定數據刪除文件中的整行

Question

我在這里是因為我用盡了所有資源來構建此程序...

我想使用像這樣的特定數據刪除文件的一行

代碼\\ t名稱\\ t Colum2 \\ t Colum3 \\ t Colum4 \\ t Colum5 \\ n

我想根據代碼刪除整行

如果我鍵入代碼，則* .py將搜索包含該字符串的行並將其刪除。

有什么好心可以幫助我嗎？

Answer 1

假設以下輸入（在generateata.com上生成 ）並保存為input.txt：

1    Jennifer O. Ingram    P.O. Box 724, 4252 Arcu. St.
2    Lacy N. Fields    5998 Scelerisque Road
3    Blythe P. Abbott    Ap #251-2931 Magna. Rd.
4    Alyssa Y. Cobb    438-8110 Enim. Rd.
5    Peter Z. May    Ap #271-8340 Eget Avenue
6    MacKenzie A. Santos    8366 Nunc. St.
7    Kevyn C. Willis    Ap #583-9635 Erat Avenue
8    Nissim E. Ward    7606 Duis Rd.
9    Duncan J. Armstrong    Ap #164-282 Id, St.
10    Jesse B. Barnett    P.O. Box 742, 5758 Sagittis Street

以下代碼將刪除代碼為5的行：

# Declare which code you want to delete.
# This can be further improved by being a parameter
# or read from outside the script.
code = 5
removed_lines = 0
f = open("input.txt","r+")
lines = f.readlines()
f.seek(0)
for line in lines:
    # Writes to the file all the lines except for those that
    # begin with the code declared above.
    if not line.startswith(str(code)):
        f.write(line)
    else:
        print("removed line %s" % line)
        removed_lines += 1
f.truncate()
f.close()
print("%d lines were removed" % removed_lines)

而input.txt將是：

1    Jennifer O. Ingram    P.O. Box 724, 4252 Arcu. St.
2    Lacy N. Fields    5998 Scelerisque Road
3    Blythe P. Abbott    Ap #251-2931 Magna. Rd.
4    Alyssa Y. Cobb    438-8110 Enim. Rd.
6    MacKenzie A. Santos    8366 Nunc. St.
7    Kevyn C. Willis    Ap #583-9635 Erat Avenue
8    Nissim E. Ward    7606 Duis Rd.
9    Duncan J. Armstrong    Ap #164-282 Id, St.
10    Jesse B. Barnett    P.O. Box 742, 5758 Sagittis Street

如果文件很大，腳本的運行可能會花費更多時間和資源。

Answer 2

您可以讀取文件，然后在寫入模式下將其打開，然后僅寫入開頭沒有該代碼的行。

//Open in read mode
f = open("yourfile.txt","r")
lines = f.readlines()
f.close()
//if code is 8
code = 8 
//Open in write mode
f = open("yourfile.txt","w")

for line in lines:
  arr = line.split('\t')
  if arr[0]!=code:   //Check for the code to avoid
    f.write(line)

f.close()